Hello - the 5 ml is what I am looking at taking. I guess I can say - even though I'm 7 yrs old - I'm scared to take something that will help to put me to sleep. Do you actually feel it taking effect on your brain? Also because I had a benign tumour removed from the surface of the mengionoma last August and there is a permanent indent in my skull, I wonder if the chemistry of my "cured" brain might react differently to the melanoma